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Evolution of the Goniatitaceae and Visean-Namurian biogeography

100%

Korn D.

Acta Palaeontologica Polonica

1997

tom 42

nr 2

177-199

Evolutionary lineages within the Carboniferous ammonoid superfamily Goniatitaceae can be recognized using cladistic and stratophenetic analyses, showing that both approaches lead to coinciding results. In the late Viséan and Namurian A, ammonoid provinces can be defined by the distribution of lineages within the goniatite superfamily Goniatitaceae. The first province corresponds to the Subvariscan Realm (where the superfamily became extinct near the Viséan-Namurian boundary), and the second embraces the majority of the occurrences, e.g. the south urals, central Asia, and North America (where the superfamily with different independent lieages continued up into the late Namurian A). In the Viséan, the superfamily was, in two short epochs, globally distributed with major transgressions, which probably led to migration events. The first is at the end of the late Viséan A (G. fimbriatus and G. spirifer Zones, when the genus Goniatites had a world-wide distribution with various species), and the second at the beginning of the late Viséan C (L. poststriatum Zone, when Lusitanoceras is globally distributed).

Late Paleozoic turrilepadid machaeridians from North America

80%

Hoare R. D., Mapes R. H., Yancey T. E., Nestell M. K.

Acta Palaeontologica Polonica

1996

tom 41

nr 2

127-145

Turrilepadids are not uncommon in late Paleozoic shales being often associated with ostracodes, foraminifers, and minute molluscs. In North America they range from the late Missippian (Chesterian) to early Permian (Leonardian). Sclerites of the inner scleritome row are more common than outer sclerites. Some clusters have been found. Sclerite consists of two layers with the thicker, lower layer penetrated by a transverse tubular structures oriented perpendicular to the sclerite surface, which may represent canals related to the papillae on the inner surface of the sclerite. Turrilepas Lepros sp. n., T. trigoniodes sp. n., T. asketos sp. n., Clarkeolepis alloeospinosa sp. n., and Ambonlepidas petalos gen. et sp. n. are proposed.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Hoare R. D.

1 Korn D.

1 Mapes R. H.

1 Nestell M. K.

1 Yancey T. E.

1 1997

1 1996

Wyniki wyszukiwania

Evolution of the Goniatitaceae and Visean-Namurian biogeography

Late Paleozoic turrilepadid machaeridians from North America